Table 1.

Participant Demographics for the Whole Sample and by Age Group

	Whole sample	Younger nurses (ages 18-35)	Middle-aged nurses (ages 36-65)	SMD	p-value
	M (SD)	M (SD)	M (SD)
n	392	165	224	--	--
Age	39.54 (11.15)	29.20 (3.78)	47.16 (8.26)	2.796	<0.001
BMI	27.28 (5.84)	25.86 (5.27)	28.33 (6.02)	0.436	<0.001
PHQ-9 total	3.63 (3.99)	4.08 (4.24)	3.28 (3.79)	0.198	0.053
SCI total	21.66 (6.90)	21.49 (6.68)	21.82 (7.06)	0.047	0.650
IL-6 (pg/mL)	2.19 (2.15)	2.01 (2.19)	2.29 (2.09)	0.129	0.210
CRP (ng/mL)	30.57 (25.28)	28.79 (27.48)	31.81 (23.54)	0.118	0.245
IL-1β (pg/mL)	0.08 (0.20)	0.07 (0.21)	0.09 (0.19)	0.098	0.337
TNF-α (pg/mL)	1.33 (1.97)	1.16 (0.57)	1.46 (2.56)	0.161	0.142

Note. SCI = Sleep Condition Indicator total score. PHQ-9 = Patient Health Questionnaire-9. IL-6 = interluekin-6. CRP = C-reactive protein. TNF-α = tumor-necrosis factor alpha. IL-1β = interleukin-1 beta. BMI = body mass index. SMD = standardized mean difference.